Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41c4bee29385b1d…

MALICIOUS

PDF

71.6 KB Created: 2021-09-12 14:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c0ce52309d8e9df6d5c1830936b3b6d SHA-1: 6a8461829bd08e3da9a35faccd94eeba5f69d2f3 SHA-256: f41c4bee29385b1d92268bf09d05d59899b3986a5650d5c7a7980abd687ce8e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/130915fde6932ec87a13f92f7efa5e37/25138502949.pdf In PDF document text
    • http://ranch.pl/files/file/satabifiduboja.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/gidupanubawiregavubi.pdfIn PDF document text
    • http://w-mill.jp/images/file/68460921102.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/69277789827.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/94290597017.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/busamepewexi.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/jitod.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091208082781.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9db6bda74---kiwazizepemijadagejiwo.pdfIn PDF document text
    • http://citranco.com/users/files/segaraxega.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/jibometilexeka.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/12795536188.pdfIn PDF document text
    • http://dsraxys.com/uploads/23320910751.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/5146347964.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/wilubitamud.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/nezotepoxuxunipajupune.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/99405104510.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/bumenuna.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/labaxef.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/22549320288.pdfIn PDF document text
    • http://akademibt.com/resimler/files/deworodusabemewogudowa.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/25924760596.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/mapomizogil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mobile+legends+live+wallpaperPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A4 16380 bytes
SHA-256: 054392dbbcb7cb4a0bb2400572816ea3c493d1b2b1a5b3f0dbbcb5d843793a26
font_01_sfnt_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 10752 bytes
SHA-256: b1c45a4ce557b462bb5b04a1be438bcdbdcbd24ed36782e04dc454adf96f5850
font_02_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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